Manava Dharmashastra 4.221

4.221

pratipadanirdiṣṭebhyo ye'nye'pyabhojyānnā asminprakaraṇe paṭhitāsteṣāṃ yadannaṃ tattvagasthiromādi | yastadīyāyāstvaco bhuktāyā doṣaḥ sa evānnasyāpi |

Medhātithi’s commentary (manubhāṣya):
There are other persons who have been mentioned in this section as those whose food should not be eaten; and the food of these men is ‘skin, bones and hairs.’ That is, the eating of their food is as improper as the eating of their skin, etc.—(221)